Unreeling system, unreeling method, rolling equipment and battery production system

Abstract

The invention provides an unwinding system, an unwinding method, rolling equipment and a battery production system, and belongs to the field of battery preparation. The unwinding system comprises a rotating tower, a pressing piece, a state confirming unit and a cutting device. The rotating tower is configured to rotate along with the rotating shaft; the turret comprises a plurality of reels and passing roller sets which are the same in number, the reels are at least provided with an unwinding station and a loading and unloading station, the reels bearing the remaining material reels are switched to the loading and unloading station, and the pressing piece can move to clamp the material belt released by the remaining material reels together with the passing roller sets in the contact position. And under the condition that the state confirmation unit confirms that the material tails of the residual material rolls are separated from the reel of the loading and unloading station or are about to be separated, the cutting device moves to cut off the material belt. When the material belt is cut off, the length of the residual material belt on the reel of the loading and unloading station is reduced, so that the length of tailings can be effectively reduced, and waste is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to an unwinding system, an unwinding method, a rolling device and a battery production system. Background Art

[0002] The current battery production process usually includes the following steps: slurry preparation - coating - rolling - die cutting - winding or lamination - shelling - liquid injection, etc. In the coating, rolling, die cutting, winding or lamination processes, the battery film material is supplied in the form of a roll, and after each process is completed, the corresponding roll is obtained by winding, so that it can be easily transferred to the next process.

[0003] During the unwinding process, when the material rolls at the unwinding station are about to run out, the positions of the material rolls are switched by rotation, and then the tape is cut and spliced. By automatically changing the rolls without stopping the machine, continuous unwinding can be achieved to improve production efficiency. In order to reduce waste, how to reduce the length of the tail material when changing the rolls and splicing the tapes during the unwinding process is a problem worthy of attention. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one purpose of the present application is to provide a reeling system, a reeling method, a rolling device and a battery production system, which can effectively reduce the length of the tail material when changing the reel and splicing the tape during the reeling process, thereby reducing waste.

[0005] An embodiment of the first aspect of the present application provides an unwinding system, including a turret, a clamping member, a status confirmation unit and a cutting device; the turret is configured to rotate with a rotating shaft; the turret includes an equal number of reels and roller groups, the rollers and reels of the roller group are parallel to the rotating shaft, and the reels and roller groups are spaced and alternately arranged along the circumference of the rotating shaft; the rotation of the turret drives the reel to switch at least between an unwinding station and a loading and unloading station; at the unwinding station, the material roll to be unwound carried by the reel is unwound to become a remaining material roll; when the reel carrying the remaining material roll is switched to the loading and unloading station, the roller group between the reel switched to the loading and unloading station and the reel switched to the unwinding station reaches a contact position to abut against the material strip released by the remaining material roll.

[0006] The pressing member can move to clamp the material strip released from the remaining material roll together with the roller group in the contact position. The state confirmation unit is used to confirm the separation state of the reel at the loading and unloading station and the tail of the remaining material roll it carries.

[0007] When the status confirmation unit confirms that the material has been separated or is about to be separated, the cutting device moves between the clamping member and the head of the roll to be unwound carried by the reel switched to the unwinding station to cut off the material strip released by the remaining roll.

[0008] In the technical solution of the embodiment of the present application, when the material tape is cut, the tail of the material tape has been separated or is about to be separated from the reel of the loading and unloading station. Therefore, when the material tape is cut, the length of the remaining material tape on the reel of the loading and unloading station is reduced, which can effectively reduce the length of the tail material and reduce waste.

[0009] In some embodiments, the clamping member includes at least one pressure roller, which is parallel to the rotating shaft; the number of rollers included in the roller group is the same as the number of pressure rollers included in the clamping member; each pressure roller can move to a one-to-one correspondence with each roller of the roller group in the contact position, and each pressure roller and the corresponding roller are opposite to each other to jointly clamp the material strip released from the remaining material roll.

[0010] The clamping member is designed as a pressure roller, and the pressure roller is in line contact with the material strip, so that the pressure distribution of the pressure roller on the material strip is more concentrated and the pressure is greater, which is conducive to the pressure roller and the passing roller to reliably clamp the material strip.

[0011] In some embodiments, the unwinding system further includes a drive motor, which is transmission-connected to the pressure roller to provide torque to the pressure roller. Under the action of the torque, the pressure roller rotates around its own axis to apply a damping force to the material strip released from the remaining roll.

[0012] In this embodiment, when the pressure roller pushes the material belt to the contact position, the damping force can be applied to the material belt by controlling the rotation of the pressure roller, so that the material belt is stretched, that is, the damping force can be converted into tension on the material belt, which is beneficial to improve the stability of the material belt transmission.

[0013] In some embodiments, the drive motor is configured to provide an adjustable torque; and / or, the rotational speed of the drive motor is adjustable; and / or, the drive motor is connected to the pressure roller via a reducer.

[0014] By adjusting the torque output by the drive motor and / or the speed of the drive motor, the tension of the material belt can be controlled. In this way, during the operation of the unwinding system, the tension of the material belt can be flexibly adjusted according to demand and working conditions, which can help improve the stability of material belt conveying and optimize production stability and accuracy.

[0015] In some embodiments, the state confirmation unit is a torque sensor, which is used to detect torque. When the change in torque exceeds a threshold, the separation state is confirmed to be separated.

[0016] The torque sensor is used to monitor the torque of the pressure roller to determine the change in the tension of the material strip, and thus determine whether the tail of the material has been separated from the corresponding reel. In this way, the tape cutting operation can be performed after the remaining material roll is completely released, so that the length of the tail material can be further reduced to reduce waste.

[0017] In some embodiments, the material strip released from the remaining material roll has a first area and a second area of ​​different colors arranged in sequence along its own transmission path, the second area is located at the tail of the material, and the color of the reel is the same as the color of the first area; the status confirmation unit is a color recognition unit, and the color recognition unit is configured to be able to face the reel of the loading and unloading station, and when the color recognition unit recognizes the color of the second area, it confirms that the separation state is about to be separated.

[0018] Compared with the torque sensor, the color recognition unit has the advantages of relying on visual feedback, not relying on torque changes, and having a fast response speed.

[0019] In some embodiments, the color recognition unit is any one of a color sensor, a spectrum sensor, and an image sensor.

[0020] In some embodiments, the color recognition unit is disposed on the turret; a plurality of color recognition units are provided and are arranged at circumferential intervals along the rotating shaft, the plurality of color recognition units correspond one-to-one to the plurality of reels, each color recognition unit is located between two adjacent reels and faces the corresponding reel; along the rotation direction of the rotating shaft, each color recognition unit is disposed at the front end of the corresponding reel.

[0021] This embodiment makes it possible to reduce the length of the remaining material strip on the reel when it is confirmed that the tail of the material is about to be separated from the reel at the loading and unloading station. This can further reduce the length of the tail material generated after the cutting device cuts the material strip, thereby further reducing waste.

[0022] In some embodiments, the unwinding system further comprises a plurality of first limiting portion groups and a lifting mechanism arranged on the turret, the plurality of first limiting portion groups correspond one to one with the plurality of roller groups, the lifting mechanism is connected to the pressure roller, and the lifting mechanism is provided with a second limiting portion group; the number of first limiting portions of the first limiting portion group is the same as the number of second limiting portions of the second limiting portion group, one of the first limiting portion and the second limiting portion is a pin hole, and the other is a pin shaft matched with the pin hole; Among them, the lifting mechanism is used to drive the pressure roller to move in the vertical direction, and the pressure roller has at least a first position and a second position; in the first position, the second limiting portion group is coaxially arranged with the first limiting portion group corresponding to the roller group in the contact position; in the second position, the second limiting portion group is plug-fitted with the first limiting portion group corresponding to the roller group in the contact position, and each pressure roller and the corresponding roller jointly clamp the material strip released from the remaining material roll.

[0023] This embodiment utilizes the matching relationship between the first limiting portion group and the second limiting portion group to limit the roller at the contact position and the pressure roller at the second position, so as to facilitate the roller at the contact position and the pressure roller at the second position to reliably clamp the material belt during the operation of the unwinding system.

[0024] In some embodiments, the turret further includes a plurality of arm groups corresponding to the plurality of rollers one by one, the arm group includes two arms spaced apart along the axial direction of the rotating shaft, the two ends of each roller are respectively connected to the two arms of the corresponding arm group, and each arm is provided with a first stopper. In this embodiment, the arm group provides a mounting base for the rollers and the first stopper.

[0025] In some embodiments, the unwinding system further includes: a lifting mechanism, the lifting mechanism being used to drive the pressing member to move in a vertical direction, so that the pressing member can move to jointly clamp the material strip released from the remaining material roll with the roller group in the contact position; The lifting mechanism includes a linear actuator and a lifting platform. The linear actuator is transmission-connected to the lifting platform to drive the lifting platform to move in a vertical direction. The pressing member is connected to the lifting platform.

[0026] In some embodiments, the linear actuator is a fluid power cylinder, which generates power through fluid to drive the lifting platform to move up and down, and the fluid pressure of the fluid power cylinder is adjustable.

[0027] In this way, by adjusting the flow rate and fluid pressure, the output force of the fluid power cylinder can be controlled, and then the pressure of the clamping member on the material belt can be adjusted, and the clamping force of the clamping member and the roller group at the contact position on the material belt can be controlled.

[0028] In some embodiments, the unwinding system further comprises a frame, and the lifting mechanism is mounted on the frame; a stop block is arranged on the frame, and the stop block has an inclined surface, the inclined surface is inclined to the horizontal plane, and the inclined surface has a first end and a second end along the inclined direction of the inclined surface; the stop block is configured to be able to move horizontally under the action of an external force to switch between a first extreme position and a second extreme position; The lifting platform comprises a fixed platform and a moving platform which are arranged opposite to each other and spaced apart in the vertical direction, the fixed platform is transmission-connected with the linear actuator, the moving platform can move vertically relative to the fixed platform, the moving platform is connected with the pressing member and is fixed with a sliding part; In the first extreme position, the sliding part abuts against the first end; when the abutting block switches from the first extreme position to the second extreme position, the sliding part slides along the inclined surface, driving the moving platform to move, so that the vertical distance between the moving platform and the fixed platform gradually increases; in the second extreme position, the sliding part abuts against the second end.

[0029] This embodiment utilizes the inclined transmission characteristics of the inclined surface and the sliding part, so that the slight displacement of the support block in the horizontal direction can be converted into a slight displacement of the moving platform in the vertical direction, so that the position of the clamping member in the vertical direction can be fine-tuned, thereby achieving fine adjustment of the roller gap between the clamping member and the roller group at the contact position.

[0030] In some embodiments, the unwinding system further comprises a hand wheel and a transmission mechanism; the hand wheel is in transmission connection with the transmission mechanism, and the hand wheel drives the supporting block to move horizontally through the transmission mechanism under the rotation of external force. This embodiment allows the operator to conveniently apply external force by holding the hand wheel.

[0031] In some embodiments, the lifting platform also includes a lifting rod extending in a vertical direction, one end of the lifting rod is fixedly connected to the moving platform, and the other end passes through the fixed platform and extends to the side of the fixed platform facing away from the moving platform, and the lifting rod can be lifted relative to the fixed platform; a stop protrusion is fixedly connected to at least one lifting rod, and the stop protrusion is located between the fixed platform and the moving platform. In the first extreme position, the stop protrusion abuts against the fixed platform, and / or the sliding portion is connected to the other end of a lifting rod.

[0032] The lifting platform is designed to also include a lifting rod, so that the movable platform is movably connected to the fixed platform, and the movable platform can move with the fixed platform and can also move independently relative to the fixed platform to achieve fine adjustment of the roller gap.

[0033] In some embodiments, the outer circumference of the roller is concave to form a spiral groove. Compared with a smooth surface, this can increase the friction between the roller and the material belt, thereby reducing the possibility of wrinkles caused by the material belt slipping.

[0034] An embodiment of the second aspect of the present application provides a rolling device, which includes two rollers arranged opposite to each other and the unwinding system in the above embodiment.

[0035] An embodiment of the third aspect of the present application provides a battery production system, the battery production system includes the unwinding system in the above embodiment, or the battery production system includes the rolling equipment in the above embodiment.

[0036] An embodiment of a fourth aspect of the present application provides an unwinding method, which is applied to the unwinding system in the above embodiment. The unwinding method includes: When the unwinding roll carried by the reel at the unwinding station becomes the remaining roll, the rotating shaft is controlled to rotate so that the reel carrying the remaining roll is switched to the loading and unloading station; Control the pressing member to move to clamp the material strip released from the remaining material roll together with the roller group in the contact position; Get the separation status and confirm whether the separation status is separated or about to separate; If the result is yes, the cutting device is controlled to move between the pressing member and the head of the roll to be unwound carried by the reel switched to the unwinding station to cut off the material strip released by the remaining roll.

[0037] In some embodiments, when the unwinding system further includes a fluid power cylinder, before the result is yes and the cutting device is controlled to move to cut the material strip between the pressing member and the material head of the unwinding roll carried by the reel switched to the unwinding station, the system further includes: The fluid pressure of the fluid power cylinder is controlled so that the pressure of the pressing member on the material strip released from the remaining material roll is increased.

[0038] This embodiment increases the clamping force on the material strip when the cutting device cuts the material strip, and maintains a large clamping force on the material strip, which is conducive to promoting neat cutting, thus helping to improve cutting accuracy and cutting effect.

[0039] In some embodiments, when the pressing member includes at least one pressing roller and the unwinding system further includes a driving motor, before the result is yes and the cutting device is controlled to move to cut the material strip between the pressing member and the material head of the unwinding roll carried by the reel switched to the unwinding station, the method further includes: The torque provided by the driving motor is controlled or the speed of the driving motor is controlled so that the damping force applied by the pressing roller to the material strip released from the remaining material roll is increased.

[0040] In this embodiment, the tension of the material strip is increased when the cutting device cuts the material strip, which is beneficial to promote neat cutting and improve cutting effect.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0043] Figure 1 This is a schematic diagram of the structure of an unwinding system in some embodiments of the present application; Figure 2 This is a simplified schematic diagram of an unwinding system in some embodiments of the present application when both reels carry a roll to be unwound; Figure 3 for Figure 2 A simplified schematic diagram of the unwinding system shown in FIG. 1 when the unwinding roll to be unwound at the unwinding station becomes the remaining roll; Figure 4 for Figure 3 A simplified schematic diagram of the unwinding system in which the unwinding roll and the remaining roll are interchanged; Figure 5 for Figure 4 A simplified schematic diagram of the unwinding system when the pressing member presses against the material strip is shown in FIG. Figure 6 for Figure 5 A simplified schematic diagram of the unwinding system when the cutting device cuts the material strip shown in FIG. Figure 7 for Figure 1 The unwinding system shown in FIG. 1 is a schematic diagram of the structure of the unwinding system when the cutting device cuts the material strip; Figure 8 A simplified schematic diagram of an unwinding system of some other embodiments of the present application when both reels carry a roll to be unwound; Fig. 9 for Figure 1 A partial schematic diagram of the unwinding system shown in ; Fig.10 for Fig. 9 A partial schematic diagram of the unwinding system shown in ; Fig.11 for Fig. 9 A partial enlarged view of point A in the middle viewed from the right.

[0044] Description of reference numerals: Unwinding system 1000; Turret 100, reel 110, unwinding reel 111A, remaining reel 111B, material belt 111, roller group 120, roller 121, pressing member 130, pressing roller 131, state confirmation unit 140, reel diameter sensor 150, arm group 160, support arm 161; Driving motor 200, reducer 210; Rotating shaft 300; Cutting device 400; Frame 500, hand wheel 510, and stop block 520; Lifting mechanism 600, linear actuator 610, lifting platform 620, fixed platform 621, movable platform 622, lifting rod 623, stopper 624, sliding part 625, pin 626; Active roller 700; Roller 2000. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0053] The term "parallel" in this application includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0054] At present, when changing rolls during the unwinding process, after the material roll that is about to be exhausted is switched to the loading and unloading station, the remaining material of the material roll at the loading and unloading station is usually judged manually by naked eye observation. When it is observed that the remaining material of the material roll at the loading and unloading station is small, the cutting device is manually triggered to cut the tape, and then the tape is spliced.

[0055] This process is not only highly dependent on the operator's experience, but also, in order to be able to cut the tape before the tape released from the material roll at the loading and unloading station completely leaves the reel to prevent the tape from falling freely, the operator usually triggers the cutting device when the number of remaining turns of the material roll at the loading and unloading station is more than one turn, so as to reserve sufficient reaction time and operation time for triggering the cutting device. However, this will increase the length of the tail material when changing the roll and splicing the tape, resulting in waste. Specifically, after verification of a large amount of production data, it is known that this method will cause the tape to be wasted by 5 to 10 meters.

[0056] In order to reduce waste, an unwinding system is designed, and the unwinding system is designed to include a status confirmation unit, which is used to monitor the separation status of the reel at the loading and unloading station and the tail of the remaining material roll it carries. A clamping piece is also designed. When preparing to change the roll, the clamping piece is used to clamp the material strip released from the remaining material roll, and then the cutting device is started to cut the material strip according to the confirmation result of the status confirmation unit to ensure that the tail of the material is about to be separated or has been separated from the reel at the loading and unloading station when cutting the material strip, so that the length of the material strip that is not released by the reel at the loading and unloading station when cutting the material strip is greatly reduced, so that the length of the tail material during unwinding, changing and splicing is small, thereby reducing waste.

[0057] In such an unwinding system, manual intervention can be effectively reduced, and the reliability and intelligence level of the unwinding system can be improved.

[0058] The unwinding system involved in the embodiment of the present application can be applied to various processes that require unwinding the material strip, such as a coating process, a rolling process, a die-cutting process, a winding process or a lamination process. In other words, the unwinding system involved in the embodiment of the present application can be used in a coating device for implementing a coating process, and accordingly, the material strip unwound by the unwinding system is a current collector; or, the unwinding system involved in the embodiment of the present application can also be used in a rolling device for implementing a rolling process, and accordingly, the material strip unwound by the unwinding system is a pole piece obtained in the coating process, and the pole piece includes a current collector and an active material arranged on at least one surface, and the rolling device also includes two rollers arranged oppositely; or, the unwinding system involved in the embodiment of the present application can also be used in a die-cutting device for implementing a die-cutting process, and accordingly, the material strip unwound by the unwinding system is a pole piece obtained in the rolling process; or, the unwinding system involved in the embodiment of the present application can also be used in a winding device for implementing a winding process, and accordingly, the material strip unwound by the unwinding system is a pole piece obtained in the die-cutting process.

[0059] In other scenarios, a battery production system may also be formed using the unwinding system, coating equipment, rolling equipment, die-cutting equipment, winding equipment, etc. involved in this application.

[0060] For the sake of clarity, the following embodiments are all described by taking the unwinding system applied to a rolling device as an example.

[0061] like Figures 1 to 7 As shown, the embodiment of the present application provides an unwinding system 1000, which includes a turret 100, a pressing member 130, a state confirmation unit 140 and a cutting device 400. The turret 100 is configured to rotate with a rotating shaft 300. The turret 100 includes an equal number of reels 110 and a plurality of roller groups 120, the rollers 121 of the roller group 120 and the reel 110 are parallel to the rotating shaft 300, and the reel 110 and the roller group 120 are spaced and alternately arranged along the circumference of the rotating shaft 300; the rotation of the turret 100 drives the reel 110 to switch at least between an unwinding station and a loading and unloading station; at the unwinding station, the material roll 111A to be unwound carried by the reel 110 is unwound to become the remaining material roll 111B; when the reel 110 carrying the remaining material roll 111B is switched to the loading and unloading station, the roller group 120 between the reel 110 switched to the loading and unloading station and the reel 110 switched to the unwinding station reaches a contact position to abut against the material belt 111 released by the remaining material roll 111B.

[0062] The pressing member 130 can move to clamp the material strip 111 released by the remaining material roll 111B together with the roller group 120 in the contact position. The state confirmation unit 140 is used to confirm the separation state between the reel 110 in the loading and unloading station and the tail of the remaining material roll 111B carried by it. In the case where the confirmation result of the state confirmation unit 140 is separation or about to be separated, the cutting device 400 moves between the pressing member 130 and the head of the material roll 111A to be unwound carried by the reel 110 switched to the unwinding station to cut off the material strip 111 released by the remaining material roll 111B.

[0063] The rotating shaft 300 extends in the horizontal direction, and the rotating shaft 300 can rotate around its own axis, thereby driving the turret 100 disposed thereon to rotate, so that all the reels 110 and the roller group 120 rotate accordingly.

[0064] Multiple reels 110 and multiple roller groups 120 correspond one to one, and a roller group 120 is provided between any two adjacent reels 110 along the circumference of the rotating shaft 300. The number of reels 110 and roller groups 120 can be selected according to actual needs and working conditions, for example, 2, 3, 4 or more. The various figures of the embodiments of the present application are shown as an example in which both the reels 110 and the roller groups 120 are 2, which should not be regarded as a limit to the present application. When both the reels 110 and the roller groups 120 are 2, the two reels 110 are interchanged between the unwinding station and the loading and unloading station, and the unwinding system 1000 in this example is a double-station unwinding system 1000. It can be understood that when the reels 110 and the roller groups 120 exceed 2, in addition to the unwinding station and the loading and unloading station, the reel 110 also has at least one material preparation station. Specifically, when there are three reels 110 and three roller groups 120, the unwinding system 1000 in this example is a three-station unwinding system 1000, and the reel 110 has an unwinding station, a loading and unloading station, and a material preparation station.

[0065] At the unwinding station, the reel 110 can rotate relative to the turret 100, so that the unwinding roll 111A set thereon is released to become the remaining roll 111B. The unwinding roll 111A refers to a new roll, which is a roll ready to be used for unwinding, and the remaining roll 111B refers to a roll that has been partially released and not completely released during the production process. It can be understood that the roll diameter of the unwinding roll 111A is larger than the roll diameter of the remaining roll 111B. At the loading and unloading station and the material preparation station, the reel 110 can be disassembled relative to the turret 100. The unwinding roll 111A has a head and a tail, the head is located at the outermost side of the unwinding roll 111A, and the tail is located at the innermost side of the unwinding roll 111A. During the unwinding process, the head is released before the tail.

[0066] The unwinding system 1000 used in the rolling equipment is as follows Figure 2As shown in the figure, two reels 110 and two roller groups 120 are provided as an example. When the initial state is set, the two reels 110 are provided with a roll 111A to be unwound. The two reels 110 are respectively located at the unwinding station and the loading and unloading station. An exemplary working process of the unwinding system 1000 of this embodiment is as follows: Step 1, such as Figure 2 As shown, the reel 110 at the unwinding station rotates around its own axis to release the unwinding roll 111A to be carried, so as to convey the material strip 111 to the roller 2000. During this process, the two roller groups 120 and the pressing member 130 do not contact the material strip 111, and the cutting device 400 and the movable roller 700 are away from the reel 110 at the unwinding station.

[0067] Step 2, until the unwinding roll 111A carried by the reel 110 of the unwinding station becomes the remaining roll 111B, as shown in FIG. Figure 3 shown.

[0068] Step 3, the rotating shaft 300 rotates, driving the turret 100 to rotate, so that the two reels 110 exchange positions, that is, the reel 110 carrying the remaining material roll 111B is switched from the unwinding station to the loading and unloading station, and the reel 110 carrying the unwinding roll 111A to be unwound is switched from the loading and unloading station to the unwinding station, such as Figure 4 As shown, the roller group 120 between the reel 110 switched to the loading and unloading station and the reel 110 switched to the unwinding station is switched to the contact position during this process. In the contact position, the roller group 120 abuts against the material strip 111 released from the remaining material roll 111B. In other words, along the rotation direction of the rotating shaft 300, a roller group 120 located at the rear end of the reel 110 carrying the remaining material roll 111B and adjacent to the reel 110 rotates with the turret 100 to abut against the material strip 111 released from the remaining material roll 111B. In this way, the material strip 111 released from the remaining material roll 111B needs to bypass the roller group 120 located at the contact position in the path of conveying to the roller 2000.

[0069] Step 4, such as Figure 5 As shown, the pressing member 130 moves to abut against the material strip 111 released from the remaining material roll 111B. The pressing member 130 and the roller assembly 120 located at the contact position are respectively located on both sides of the material strip 111 to clamp the material strip 111 together.

[0070] Step 5: The reel 110 carrying the remaining material roll 111B continues to rotate around its own axis to unwind until the state confirmation unit 140 confirms that the separation state of the tail of the remaining material roll 111B and the corresponding reel 110 is separated or about to be separated. Figure 6 and Figure 7As shown, the cutting device 400 is controlled to move between the pressing member 130 and the head of the unwinding roll 111A carried by the reel 110 switched to the unwinding station to cut off the material strip 111 released from the remaining roll 111B, so that the tail material is disconnected.

[0071] Step 6, such as Figure 6 and Figure 7 As shown, the movable roller 700 moves and abuts the cut end of the material strip 111 against the material head of the material roll 111A to be unwound of the reel 110 at the unwinding station, so that the cut end of the material strip 111 is bonded to the adhesive layer of the material head of the material roll 111A to be unwound, and then returns to step 1 to continue unwinding; at the same time, the pressing member 130 moves to restore to the original position, and then the reel 110 loaded with the material roll 111A to be unwound can be replaced to the loading and unloading station. This cycle can be repeated to achieve automatic roll change and unwinding.

[0072] The unwinding system 1000 of this embodiment is designed to include a pressing member 130, a state confirmation unit 140 and a cutting device 400, and the pressing member 130 is designed to move to the contact position with the roller group 120 to clamp the material strip 111 released by the remaining material roll 111B, and the state confirmation unit 140 can confirm the separation state of the tail of the remaining material roll 111B and the corresponding reel 110. In this way, when the unwinding roll 111A to be unwound at the unwinding station is released to become the remaining material roll 111B, and the remaining material roll 111B is switched to the loading and unloading station to prepare for roll replacement, the pressing member 130 is used to press the material strip 111 released by the remaining material roll 111B, and then the material strip 111 is cut when the tail of the remaining material roll 111B has been separated or is about to be separated from the corresponding reel 110.

[0073] Therefore, when the material strip 111 is cut, the length of the remaining material strip 111 on the reel 110 at the loading and unloading station is less than one circle, which can effectively reduce the length of the tail material and reduce waste. Moreover, the action of the cutting device 400 cutting the material strip 111 can also occur after the tail of the remaining material roll 111B has been separated from the corresponding reel 110, and the pressing member 130 and the roller group 120 at the contact position still clamp the material strip 111. In this way, firstly, the possibility of the tail of the remaining material roll 111B falling freely after being separated from the corresponding reel 110 can be reduced, and secondly, the clamping effect of the pressing member 130 and the roller group 120 at the contact position on the material strip 111 can make the material strip 111 tightened to a certain extent, which can bring a positive effect for the cutting device 400 to cut the material strip 111.

[0074] In addition, in this embodiment, the cutting device 400 can be automatically triggered according to the confirmation result of the state confirmation unit 140, which reduces manual intervention and has a high degree of automation.

[0075] In the unwinding system 1000 disclosed herein, the above-mentioned roller 121 can be configured to be fixed, or can be configured to be able to rotate around its own axis. The number of rollers 121 in the roller group 120 is unlimited. For example, please refer to Figures 2 to 7 , the roller group 120 includes a roller 121. Or, as Figure 8 As shown, the roller group 120 includes two rollers 121. The two rollers 121 of any roller group 120 located at the contact position are arranged in parallel. In this example, the material tape 111 released from the remaining material roll 111B contacts the two rollers 121 in the path of conveying to the roller 2000.

[0076] In the unwinding system 1000 disclosed herein, the specific structure of the pressing member 130 is various. As an example, when the roller group 120 includes two rollers 121, the pressing member 130 can be Figure 8 The flat plate structure shown may be a block structure or the like.

[0077] According to some embodiments of this application, please combine Figures 1 to 7 The pressing member 130 may include at least one pressing roller 131, and the pressing roller 131 is parallel to the rotating shaft 300. The number of rollers 121 included in the roller group 120 is the same as the number of pressing rollers 131 included in the pressing member 130. Each pressing roller 131 can move to correspond to each roller 121 of the roller group 120 in the contact position, and each pressing roller 131 and the corresponding roller 121 are opposite to each other to jointly clamp the material strip 111 released from the remaining material roll 111B.

[0078] As an example, Figures 1 to 7 As shown, the roller group 120 includes a roller 121, and correspondingly, the pressing member 130 is a pressure roller 131, and the pressure roller 131 can push the material strip 111 released from the remaining material roll 111B to the roller 121 at the contact position. In an embodiment not shown in the figure, the roller group 120 includes two rollers 121, and correspondingly, the pressing member 130 is two pressure rollers 131, the axes of the two pressure rollers 131 are located in the same horizontal plane, and the two pressure rollers 131 can correspond one-to-one with the two rollers 121 at the contact position.

[0079] Compared with the technical solution in which the clamping piece 130 is a flat plate structure and the flat plate structure is in surface contact with the material strip 111, the clamping piece 130 is designed as a pressure roller 131. The shape of the pressure roller 131 is adapted to the shape of the over roller 121. The pressure roller 131 is in line contact with the material strip 111, so that the pressure distribution of the pressure roller 131 on the material strip 111 is more concentrated and the pressure is greater, which is beneficial for the pressure roller 131 and the over roller 121 to reliably clamp the material strip 111.

[0080] As an example, the pressure roller 131 may be, but is not limited to, a metal roller or a rubber roller. The material of the rubber roller may be any one of rubber and polyurethane (PU). Under the premise that the pressure roller 131 and the roller 121 can clamp the material strip 111, the rubber roller has the effect of less damage to the material strip 111 than the metal roller.

[0081] According to some embodiments of the present application, please refer to Figure 1 and Fig. 9 In the solution where the clamping member 130 is a pressure roller 131, the unwinding system 1000 may further include a drive motor 200, which is transmission-connected to the pressure roller 131 to provide torque to the pressure roller 131. Under the action of the torque, the pressure roller 131 rotates around its own axis to apply a damping force to the material strip 111 released from the remaining material roll 111B.

[0082] Damping force refers to the force that slows down the movement of the material strip 111 through friction or reverse force. Specifically, in the above step 4, when the pressure roller 131 and the contact roller 121 jointly clamp the material strip 111, the drive motor 200 can drive the pressure roller 131 to rotate in a preset direction, which is the same as the rotation direction of the reel 110 for unwinding. As an example, Figures 2 to 6 , the reel 110 rotates counterclockwise, so that the unreleased material roll 111A or the remaining material roll 111B is released to convey the material strip 111 to the roller 2000, and the pressing roller 131 also rotates counterclockwise. In other words, the driving motor 200 drives the pressing roller 131 to rotate, thereby applying a damping force opposite to the movement of the material strip 111.

[0083] It should be understood that, according to the foregoing description, when the roller assembly 120 includes a plurality of rollers 121 , the pressing member 130 also includes a plurality of pressure rollers 131 , and each pressure roller 131 can receive torque to rotate around its own axis.

[0084] The unwinding system 1000 is designed to also have a driving motor 200 to provide torque for the pressure roller 131, so that when the pressure roller 131 pushes the material strip 111 to the contact position of the roller 121, a damping force can be applied to the material strip 111 by controlling the rotation of the pressure roller 131, so that the material strip 111 is stretched, that is, the damping force can be converted into tension on the material strip 111, which is beneficial to improve the stability of the transmission of the material strip 111.

[0085] As some optional examples of the present application, the driving motor 200 is configured to provide an adjustable torque.

[0086] The driving motor 200 may be any one of a servo motor, a stepper motor, etc. As an example, the driving motor 200 is a servo motor, and the torque output by the servo motor is proportional to the driving current, and the torque can be adjusted by adjusting the driving current.

[0087] It can be understood that when the pressure roller 131 pushes the material strip 111 against the roller 121 at the contact position, if the torque output by the drive motor 200 increases, the blocking effect on the material strip 111 increases accordingly, that is, the damping force increases. In other words, by designing the torque of the drive motor 200 to be adjustable, the damping force is adjustable, so as to facilitate the regulation of the tension of the material strip 111.

[0088] Optionally, the speed of the driving motor 200 can be adjusted, and / or, please continue to refer to Figure 1 and Fig. 9 The driving motor 200 can also be connected to the pressure roller 131 through the reducer 210.

[0089] As an example, the speed of the drive motor 200 is adjustable. The drive motor 200 may be implemented as a servo motor, and in this example, the speed may be changed by adjusting the input voltage of the servo motor, adjusting the speed command, etc. The drive motor 200 may be implemented as a stepper motor, and in this example, the speed may be adjusted by adjusting the frequency of the input pulses.

[0090] This embodiment can reduce the rotation speed of the pressure roller 131. In this way, during the operation of the unwinding system 1000, when the pressure roller 131 pushes the material strip 111 against the roller 121 at the contact position, the speed of the pressure roller 131 is reduced, so that there is a difference between the speed of the pressure roller 131 and the speed of the material strip 111. The relative movement between the pressure roller 131 and the material strip 111 will generate greater friction resistance, which can increase the damping force, thereby increasing the tension on the material strip 111.

[0091] In combination with the foregoing content, it can be known that by adjusting the torque output by the drive motor 200 and / or the speed of the drive motor 200, the tension of the material belt 111 can be controlled. In this way, during the operation of the unwinding system 1000, the tension of the material belt 111 can be flexibly adjusted according to demand and working conditions, which can be beneficial to improving the conveying stability of the material belt 111, and to optimizing production stability and accuracy.

[0092] For example, step 4 may specifically be to control the movement of the pressing roller 131 to press the material strip 111 released from the remaining material roll 111B against the roller group 120 located at the contact position, and provide torque to the pressing roller 131 through the driving motor 200, wherein the torque magnitude is N1 and the speed of the driving motor 200 is W1; in step 5, when the state confirmation unit 140 confirms that the separation state between the tail of the remaining material roll 111B and the corresponding reel 110 is separated or about to be separated, the torque magnitude may be controlled to increase from N1 to N2 and the speed of the driving motor 200 may be controlled to decrease from W1 to W2, and then the cutting device 400 may be controlled to cut the material strip 111. In this way, the tension on the material strip 111 when the cutting device 400 cuts the material strip 111 is increased, that is, the material strip 111 is tightened during cutting, which is conducive to improving the cutting accuracy.

[0093] Compared with stepper motors, servo motors have the advantage of high output torque, and servo motors are closed-loop controlled, so that the speed and torque can be accurately controlled through the closed-loop control system, thereby achieving accurate control of the damping force.

[0094] It can be understood that during the operation of the unwinding system 1000, as the remaining material roll 111B continues to unwind, the position of the tail of the remaining material roll 111B continues to change. When the material belt 111 is unwound, the connection status between the remaining material roll 111B and the reel 110 of the loading and unloading station will also change. The status confirmation unit 140 can confirm the separation status according to these changes.

[0095] According to some embodiments of the present application, in a solution where the unwinding system 1000 also includes a drive motor 200, the above-mentioned state confirmation unit 140 can be implemented as a torque sensor, which is used to detect torque. When the change in torque exceeds a threshold, the separation state is confirmed to be separated.

[0096] It can be understood that during the continuous release of the remaining material roll 111B, the torque of the pressure roller 131 is stable, and the pressure roller 131 and the over roller 121 clamp the material strip 111, so that the material strip 111 maintains a certain tension. When the remaining material roll 111B is completely released, the material tail separates from the corresponding reel 110, and the material tail loses tension, and the torque of the pressure roller 131 also decreases. The torque sensor detects that the change in torque exceeds the threshold value and confirms that the material tail has been separated from the corresponding reel 110.

[0097] By designing the state confirmation unit 140 as a torque sensor, the torque sensor is used to monitor the torque of the pressure roller 131 to determine the change in the tension of the material strip 111, and thereby determine whether the tail of the material has been separated from the corresponding reel 110. It should be pointed out that with this design, the tape cutting operation can be performed after the remaining material roll 111B is completely released. It can be seen that when the tape is cut, there is no material strip 111 remaining on the reel 110 at the loading and unloading station, which can further reduce the length of the tail material to reduce waste.

[0098] According to some embodiments of the present application, the material strip 111 released from the remaining material roll 111B has a first area and a second area that are sequentially arranged and have different colors along its own transmission path, the second area is located at the end of the material, and the color of the reel 110 is the same as the color of the first area. In this example, the state confirmation unit 140 can be implemented as a color recognition unit, and the color recognition unit is configured to be able to face the reel 110 of the loading and unloading station, and when the color recognition unit recognizes the color of the second area, it confirms that the separation state is about to be separated.

[0099] During the operation of the unwinding system 1000 of the present embodiment, after the reel 110 carrying the remaining material roll 111B is switched to the loading and unloading station, the remaining material roll 111B will continue to be unwound, and the color recognition unit will face the reel 110 at the loading and unloading station and identify the color. Since the color of the second area is different from the color of the reel 110 and the color of the first area, when the color of the second area is identified, it can be confirmed that the second area is monitored. In addition, the second area is located at the tail of the material, which means that the tail of the material is exposed to the outside, and it can be confirmed that the tail of the material is about to be separated from the reel 110 at the loading and unloading station.

[0100] The state confirmation unit 140 is designed as a color recognition unit. The color of the second area of ​​the tail is detected by the color recognition unit, so that it can be determined that the tail is exposed to the outside, thereby confirming that the tail is about to be separated from the reel 110 of the loading and unloading station. Compared with the torque sensor, the color recognition unit has the advantages of relying on visual feedback, not relying on torque changes, and fast response speed.

[0101] As an example, a tape may be provided at the tail of the material, and the color of the tape is different from the color of the material tape 111 itself and the color of the reel 110 . In this example, the tape is the second area.

[0102] As an example, the second area may also refer to an area where the color of the tail itself is different from the color of the reel 110 and the color of the first area. For example, the material strip 111 is a pole piece, which includes a current collector and an active material disposed on at least one surface, and the tail of the pole piece has an area without active material coating to serve as the second area. In this example, the color of the first area is the color of the active material, that is, black, and the color of the second area is the color of the current collector itself. Taking the current collector material as copper as an example, the color of the second area is yellow. In this embodiment, the color recognition unit can confirm the separation state by identifying the color of the tail itself, that is, monitoring can be achieved by utilizing the characteristics of the material strip 111 itself, without the need for additional tape, etc. This method is simple and accurate.

[0103] In the unwinding system 1000 disclosed herein, the color recognition unit may be any one of a color sensor, a spectrum sensor, and an image sensor (CMOS).

[0104] The installation position of the color recognition unit should be reasonably designed so that the color recognition unit can meet the reel 110 facing the loading and unloading station, and then can recognize the color of the second area. As an optional example of the present application, the unwinding system 1000 can also include a mounting seat, the mounting seat is close to the turret 100, and the color recognition unit can be fixedly set on the mounting seat.

[0105] According to some embodiments of the present application, Figure 1 As shown, the color recognition unit is disposed on the turret 100. At the same time, a plurality of color recognition units are provided and are arranged at intervals along the circumference of the rotating shaft 300. The plurality of color recognition units correspond to the plurality of reels 110 one by one, and each color recognition unit is located between two adjacent reels 110 and faces the corresponding reel 110. Along the rotation direction of the rotating shaft 300, each color recognition unit is disposed at the front end of the corresponding reel 110.

[0106] exist Figures 1 to 7 In the example shown, there are two reels 110, and accordingly, there are two color recognition units. Each color recognition unit is located between the two reels 110 and surrounds the center of the rotating shaft 300, and the two color recognition units are spaced 180 degrees apart. Figure 4 In the embodiment, a color recognition unit located at the top corresponds to the reel 110 of the loading and unloading station, and a color recognition unit located at the bottom corresponds to the reel 110 of the unwinding station.

[0107] In this embodiment, each reel 110 corresponds to a color recognition unit, so that the unwinding status of each reel 110 can be reliably understood according to the confirmation results of each color recognition unit. Since the color recognition unit is arranged on the turret 100, when the turret 100 rotates with the rotating shaft 300 to drive each reel 110 to switch positions, the color recognition unit rotates accordingly and remains facing the corresponding reel 110 to achieve monitoring. By arranging the color recognition unit on the turret 100, there is no need to design a mounting seat.

[0108] Please combine Figure 7 During the operation of the unwinding system 1000 of this embodiment, if the color recognition unit confirms that the tail of the remaining material roll 111B is about to separate from the reel 110 of the loading and unloading station, the cutting device 400 immediately cuts off the material strip 111, and the resulting tail is the cd segment. In other words, when the material strip 111 is cut, the tail is located at point c, that is, at the upper half of the arc of the reel 110.

[0109] When each color recognition unit is located at the rear end of the corresponding reel 110 along the rotation direction of the rotating shaft 300, when the unwinding system 1000 is in operation, if the color recognition unit confirms that the tail of the remaining material roll 111B is about to separate from the reel 110 at the loading and unloading station, the cutting device 400 immediately cuts off the material strip 111. At this time, the tail is located at the lower right quarter arc of the reel 110, that is, between points a and b. It can be understood that when the reel 110 rotates counterclockwise so that the remaining material roll 111B continues to be unwound, the tail follows the reel 110 from point a to point b, and then from point b to point c.

[0110] In contrast, the present embodiment is designed such that when the reel 110 is switched to the loading and unloading station, the corresponding color recognition unit is located above the reel 110, and when it is confirmed that the tail of the material is about to be separated from the reel 110 at the loading and unloading station, the length of the remaining material strip 111 on the reel 110 is smaller. This can further reduce the length of the tail material generated after the cutting device 400 cuts off the material strip 111, thereby further reducing waste.

[0111] In order to enable the reel 110 carrying the remaining material roll 111B to be switched from the unwinding station to the loading and unloading station in time to prepare for reel change, multiple reel diameter detection units can be arranged at intervals along the circumference of the rotating shaft 300. The multiple reel diameter detection units correspond to the multiple reels 110 one by one. Each reel diameter detection unit is located between two adjacent reels 110 and faces the corresponding reel 110 to detect the reel diameter of the corresponding reel 110. When the detected reel diameter is less than the set value, it is confirmed that the unwinding reel 111A is released to become the remaining material reel 111B. Among them, the reel diameter detection unit can be implemented by using a reel diameter sensor 150, an encoder, etc.

[0112] According to some embodiments of the present application, in the solution where the pressing member 130 is a pressure roller 131, the unwinding system 1000 may further include a lifting mechanism 600 and a plurality of first position limiting part groups, the plurality of first position limiting part groups are arranged on the turret 100, and the plurality of first position limiting part groups correspond one to one with the plurality of roller groups 120. The lifting mechanism 600 is connected to the pressure roller 131, and the lifting mechanism 600 is provided with a second position limiting part group, and the number of first position limiting parts of the first position limiting part group is the same as the number of second position limiting parts of the second position limiting part group. Among them, one of the first position limiting part and the second position limiting part is a pin hole, and the other is a pin shaft 626 matched with the pin hole.

[0113] The lifting mechanism 600 is used to drive the pressure roller 131 to move in the vertical direction. The pressure roller 131 has at least a first position and a second position. In the first position, the second limiter group is coaxially arranged with the first limiter group corresponding to the roller group 120 in the contact position. In the second position, the second limiter group is plug-fitted with the first limiter group corresponding to the roller group 120 in the contact position, and each pressure roller 131 and the corresponding roller 121 jointly clamp the material strip 111 released from the remaining material roll 111B.

[0114] As an example, combine Figure 1 , Fig. 9 and Fig.10 , the first limiting part is a pin hole, the second limiting part is a pin shaft 626, and the axis of the pin shaft 626 extends in the vertical direction. The first limiting part group is provided with 2 pin holes, and the second limiting part group is provided with 2 pin shafts 626. When the unwinding system 1000 of this embodiment is in operation, the pressure roller 131 in the above steps 1 to 3 is located in the first position, and when the roller group 120 between the reel 110 switched to the loading and unloading station and the reel 110 switched to the unwinding station in step 3 reaches the contact position, the axis of each pin shaft 626 is colinear with the center line of a pin hole. Next, the above step 4 is specifically that the lifting mechanism 600 drives the pressure roller 131 to move in the vertical direction to approach the roller group 120 in the contact position, and the pin shaft 626 is gradually inserted into the corresponding pin hole until the pressure roller 131 presses against the material belt 111, and the pin shaft 626 cooperates with the pin hole. After the material strip 111 is cut, the lifting mechanism 600 drives the pressing roller 131 to move in the vertical direction to move away from the roller assembly 120 at the contact position, and the pin shaft 626 gradually withdraws from the corresponding pin hole.

[0115] The number of pin holes included in the first limiting portion group and the number of pin shafts 626 included in the second limiting portion group can also be set to 1, 3, 4 or more according to needs.

[0116] As an example, the first limiting portion may be replaced by the pin shaft 626, and the second limiting portion may be replaced by the pin hole.

[0117] This embodiment utilizes the matching relationship between the first limiting portion group and the second limiting portion group to limit the roller 121 at the contact position and the pressure roller 131 at the second position, thereby reducing the possibility of the roller 121 at the contact position and the pressure roller 131 at the second position deviating under the drive of the moving material belt 111, so that the roller 121 at the contact position and the pressure roller 131 at the second position can remain parallel to the rotating shaft 300, so as to facilitate the roller 121 at the contact position and the pressure roller 131 at the second position to reliably clamp the material belt 111 during the operation of the unwinding system 1000.

[0118] According to some embodiments of this application, please continue to refer to Figure 1 , Figure 7 , Fig. 9 and Fig.10 The turret 100 may also include a plurality of arm groups 160 corresponding one to one with the plurality of rollers 121, the arm group 160 includes two support arms 161 spaced apart and arranged opposite to each other along the axial direction of the rotating shaft 300, the two ends of each roller 121 are respectively connected to the two support arms 161 of the corresponding arm group 160, and each support arm 161 is provided with a first limiting portion.

[0119] That is, the roller 121 is disposed between and connected to the two arms 161. The arm 161 protrudes from the turret 100, and one end of the arm 161 away from the turret 100 has a plate body, on which a pin 626 or a pin hole is disposed. When the roller 121 corresponding to the arm group 160 is in the contact position, the center line of the pin 626 or the pin hole on the plate body extends vertically.

[0120] In this embodiment, the arm group 160 is designed so that the arm group 160 can provide a mounting base and support for the roller 121 and can also provide a mounting base for the first limiting portion.

[0121] Of course, in other examples not shown in the figure, the turret 100 includes two base plates spaced apart and arranged opposite to each other along the axial direction of the rotating shaft 300, and the reel 110 and the roller 121 can be installed on the two base plates. In this example, the first limiter can also be replaced by being arranged on the base plate.

[0122] As in the unwinding system 1000 disclosed herein, the movement of the clamping member 130 to the contact position with the roller 121 to clamp the material strip 111 together may be movement or swinging, and this embodiment does not impose any specific limitation on this.

[0123] According to some embodiments of this application, please continue to refer to Figure 1 , Figure 7 , Fig. 9 and Fig.10 The unwinding system 1000 may further include a lifting mechanism 600, which is used to drive the pressing member 130 to move in the vertical direction, so that the pressing member 130 can be lifted and lowered to switch between the first position and the second position. The lifting mechanism 600 is specifically configured to include a linear actuator 610 and a lifting platform 620, the linear actuator 610 is transmission-connected to the lifting platform 620 to drive the lifting platform 620 to move in the vertical direction, and the pressing member 130 is connected to the lifting platform 620.

[0124] The linear actuator 610 may be implemented as any one of a linear motor, an electric push rod, and a fluid power cylinder (eg, a hydraulic cylinder, a pneumatic cylinder).

[0125] As an example, the linear actuator 610 is Fig. 9 and Fig.10The fluid power cylinder shown is a hydraulic cylinder or a gas cylinder. The fluid power cylinder generates power through fluid to drive the lifting platform 620 to move up and down, and the fluid pressure of the fluid power cylinder is configured to be adjustable.

[0126] When a hydraulic cylinder is selected as the linear actuator 610, the hydraulic cylinder and the hydraulic pump constitute a hydraulic system. An electro-hydraulic proportional valve can be designed between the hydraulic pump and the hydraulic cylinder to control the flow and hydraulic pressure of the hydraulic cylinder, or a pressure control valve (such as a relief valve) can be designed at the outlet of the hydraulic pump to control the flow and hydraulic pressure of the hydraulic cylinder.

[0127] Similarly, when a cylinder is selected as the linear actuator 610, the cylinder and the air source constitute a pneumatic system, and an electrical proportional valve can be set on the pipeline between the air source and the cylinder to control the air intake and air pressure of the cylinder, or a flow control valve can be installed at the air inlet of the cylinder.

[0128] A fluid power cylinder is used to provide power for the lifting of the clamping member 130, and the fluid power cylinder is designed to have adjustable fluid pressure. In this way, by adjusting the flow rate and fluid pressure, the output force of the fluid power cylinder can be adjusted, and the pressure of the clamping member 130 on the material strip 111 can be adjusted, and the clamping force of the clamping member 130 and the roller group 120 at the contact position on the material strip 111 can be adjusted. In this way, during the operation of the unwinding system 1000, the clamping force of the clamping member 130 and the roller group 120 at the contact position on the material strip 111 can be flexibly adjusted according to demand and working conditions, which is conducive to optimizing the production yield.

[0129] Exemplarily, step 4 may specifically be to control the movement of the pressure roller 131 to press the material strip 111 released from the remaining material roll 111B against the roller group 120 located at the contact position, and control the output force of the fluid power cylinder to realize the pressure applied to the material strip 111 by the pressure roller 131, wherein the fluid pressure of the fluid power cylinder is P1 and the output force is F1; in step 5, when the status confirmation unit 140 confirms that the separation state between the tail of the remaining material roll 111B and the corresponding reel 110 is separated or about to be separated, the fluid pressure of the fluid power cylinder may be controlled to increase from P1 to P2 and the output force may be controlled to increase from F1 to F2, and then the cutting device 400 may be controlled to cut the material strip 111. In this way, on the one hand, before the cutting device 400 cuts off the material strip 111, a smaller clamping force is maintained on the material strip 111, which helps to reduce the possibility that the material strip 111 is over-extruded and damaged or deformed due to excessive clamping force. On the other hand, by increasing the clamping force on the material strip 111 when the cutting device 400 cuts off the material strip 111, a larger clamping force is maintained on the material strip 111, which helps to promote neat cutting, which helps to improve cutting accuracy and cutting effect.

[0130] Of course, in other embodiments of the present application, the linear actuator 610 may also be replaced by a rotational power source (eg, a motor) and a motion conversion mechanism, which is capable of converting the rotational power provided by the rotational power source into linear power and providing it to the lifting platform 620 .

[0131] According to some embodiments of the present application, in the solution where the unwinding system 1000 further includes a lifting mechanism 600, further, please continue to refer to Figure 1 , Figure 7 , Fig. 9 and Fig.10 The unwinding system 1000 may further include a frame 500 , and the lifting mechanism 600 is installed on the frame 500 . The frame 500 provides support and an installation basis for the lifting mechanism 600 .

[0132] Please combine Figures 9 to 11 The frame 500 is further provided with a support block 520, which has an inclined surface, which is inclined to the horizontal plane, and has a first end ( Fig.11 The middle is the left end) and the second end ( Fig.11 The abutting block 520 is configured to be able to move horizontally under the action of an external force to switch between a first extreme position and a second extreme position.

[0133] The lifting platform 620 includes a fixed platform 621 and a movable platform 622 which are arranged opposite to each other and spaced apart in the vertical direction. The fixed platform 621 is transmission-connected to the linear actuator 610 , and the movable platform 622 can move vertically relative to the fixed platform 621 . The movable platform 622 is connected to the clamping member 130 and is fixed with a sliding portion 625 .

[0134] In the first extreme position, the sliding portion 625 abuts against the first end; when the abutting block 520 switches from the first extreme position to the second extreme position, the sliding portion 625 slides along the inclined surface, driving the moving platform 622 to move, so that the vertical distance between the moving platform 622 and the fixed platform 621 gradually increases; in the second extreme position, the sliding portion 625 abuts against the second end.

[0135] As an example, combine Figures 9 to 11 The inclined surface is inclined relative to the axis of the rotating shaft 300, and extends upward from the first end to the second end. Specifically, the thickness of the abutting block 520 gradually decreases from the first end to the second end. In other words, when the extending direction of the rotating shaft 300 is set as the left-right direction of the unwinding system 1000 and the horizontal direction perpendicular to the axis of the rotating shaft 300 is set as the front-back direction of the unwinding system 1000, Figures 9 to 11 The middle slope extends obliquely along the front-to-back direction. In this example, the abutment block 520 is correspondingly configured to move along the front-to-back direction to switch between the first extreme position and the second extreme position.

[0136] In an example not shown in the figure, the inclined surface can also be replaced by an inclined extension along the left and right directions of the unwinding system 1000. In this example, the stop block 520 is correspondingly configured to move along the left and right directions to switch between the first extreme position and the second extreme position.

[0137] In the unwinding system 1000 disclosed herein, the abutment block 520 includes but is not limited to a roller, a slider, Fig.11 The pulley shown in the figure is in line contact with the inclined surface, so that the contact area between the pulley and the inclined surface is small, and the friction force is small, so that the pulley can slide smoothly along the inclined surface during the switching process between the first limit position and the second limit position of the support block 520.

[0138] When the unwinding system 1000 of this embodiment is in operation, the linear actuator 610 drives the fixed platform 621 to rise and fall, thereby causing the movable platform 622 and the pressing member 130 connected thereto to rise and fall. In addition, by applying an external force to the abutting block 520, the abutting block 520 can move between the first limit position and the second limit position. By means of the matching relationship between the inclined surface and the sliding portion 625, the horizontal displacement of the abutting block 520 will be converted into the vertical displacement of the movable platform 622, so that the movable platform 622 can move vertically relative to the fixed platform 621, thereby driving the pressing member 130 to move vertically.

[0139] This embodiment utilizes the inclined surface and the inclined surface transmission characteristics of the sliding part 625, so that the slight displacement of the support block 520 in the horizontal direction can be converted into a slight displacement of the movable platform 622 in the vertical direction, so that the position of the clamping member 130 in the vertical direction can be fine-tuned, thereby achieving fine adjustment of the roller gap between the clamping member 130 and the roller group 120 at the contact position.

[0140] It is understandable that when the material strip 111 is a pole piece, the thickness of the pole piece is inconsistent due to the limitation of the process level such as the processing and manufacturing precision. During the operation of the unwinding system 1000 of this embodiment, the roll gap size can be flexibly adjusted, so that it can be applied to pole pieces of different thicknesses and has good process compatibility. At the same time, by adjusting the roll gap size, the clamping member 130 and the roller 121 can maintain the clamping of pole pieces of various thicknesses.

[0141] Compared with directly using a fluid power cylinder to drive the clamping piece 130 to rise and fall to adjust the roller gap size, the present embodiment sets the inclined surface and the sliding part 625 to adjust the roller gap, which has the following effects: First, the stroke of the fluid power cylinder is usually large, which is not easy to control within a small range and difficult to achieve precise adjustment. The inclined surface transmission effect of the push-in block 520 in the present embodiment amplifies the tiny displacement, making the lifting and lowering of the moving platform 622 and the clamping piece 130 smoother and more precise, thereby achieving fine-tuning. Second, the mechanical transmission structure composed of the inclined surface and the sliding part 625 of the push-in block 520 can achieve higher adjustment accuracy and stability with low power consumption, thereby reducing the stroke requirement and load of the fluid power cylinder.

[0142] According to some embodiments of this application, please continue to refer to Figures 9 to 11 The unwinding system 1000 may further include a hand wheel 510 and a transmission mechanism. The hand wheel 510 is in transmission connection with the transmission mechanism, and the hand wheel 510 drives the supporting block 520 to move horizontally through the transmission mechanism when the hand wheel 510 rotates under external force.

[0143] When the unwinding system 1000 of this embodiment is in operation, the operator can rotate the hand wheel 510. During the rotation of the hand wheel 510, the transmission mechanism drives the abutment block 520 to move. The transmission mechanism can be implemented as a gear rack mechanism, a screw nut mechanism, etc.

[0144] By designing the hand wheel 510 and the transmission mechanism, the operator can conveniently hold the hand wheel 510 to apply a small rotational force to move the abutting block 520 to adjust the roller gap.

[0145] Of course, in other embodiments of the present application, the hand wheel 510 can also be replaced by a handle or a push rod, and the handle or the push rod moves under the action of an external force to drive the push block 520 to translate. During the operation, the operator can apply a thrust or a pull to the handle or the push rod.

[0146] According to some embodiments of this application, please continue to refer to Fig. 9 and Fig.10 The lifting platform 620 may also include a lifting rod 623 extending in the vertical direction, one end of the lifting rod 623 is fixedly connected to the moving platform 622, and the other end passes through the fixed platform 621 and extends to the side of the fixed platform 621 facing away from the moving platform 622. The lifting rod 623 can be raised and lowered relative to the fixed platform 621.

[0147] A stop protrusion 624 is fixedly connected to at least one lifting rod 623 , and the stop protrusion 624 is located between the fixed platform 621 and the movable platform 622 . In the first extreme position, the stop protrusion 624 abuts against the fixed platform 621 , and / or the sliding part 625 is connected to the other end of a lifting rod 623 .

[0148] The number of the lifting rods 623 of the lifting platform 620 can be designed according to the requirements, and this embodiment does not specifically limit this. Fig. 9 As shown, the lifting platform 620 is provided with five lifting rods 623 , of which four lifting rods 623 have circular cross-sections and are fixedly connected with stopper protrusions 624 , and the remaining lifting rod 623 has a rectangular cross-section and the other end is connected to a sliding part 625 .

[0149] When the unwinding system 1000 of this embodiment is in operation, in the initial state, the abutting block 520 is at the first limit position, the sliding portion 625 abuts against the first end of the inclined surface, and each stopper 624 abuts against the fixed platform 621. At this time, the vertical distance between the fixed platform 621 and the moving platform 622 is h1. The above step 4 can be specifically that the linear actuator 610 drives the fixed platform 621 to move upward, thereby driving the stopper 624 abutting against the fixed platform 621 to move upward, and the moving platform 622 moves upward accordingly, until the pressing member 130 reaches the second position. Next, the above-mentioned step 5 can be specifically that when the status confirmation unit 140 confirms that the separation state of the tail of the remaining material roll 111B and the corresponding reel 110 is separated or about to be separated, an external force is first applied to make the push block 520 translate toward the second extreme position. During this process, the inclined surface cooperates with the sliding part 625 to make the sliding part 625 move upward, driving each lifting rod 623 and the moving platform 622 to move upward relative to the fixed platform 621, and the stop protrusion 624 moves away from the fixed platform 621, and the vertical distance between the fixed platform 621 and the moving platform 622 gradually increases; until the push block 520 reaches the second extreme position, at this time the vertical distance between the fixed platform 621 and the moving platform 622 is h2, h2>h1.

[0150] The lifting platform 620 is designed to also include a lifting rod 623, so that the movable platform 622 is movably connected to the fixed platform 621, and the movable platform 622 can move with the fixed platform 621 and can move independently relative to the fixed platform 621 to achieve fine adjustment of the roller gap.

[0151] According to some embodiments of this application, please continue to refer to Figure 1 , Fig. 9 and Fig.10 The roller 121 may also be designed so that its outer peripheral surface is concave to form a spiral groove.

[0152] As an example, the spiral groove may extend from one end of the roller 121 to the other end of the roller 121. As an example, the roller 121 includes a first section and a second section coaxially arranged, and the outer circumference of the first section and the outer circumference of the second section are both formed with a spiral groove, and the rotation direction of the spiral groove on the first section is opposite to that of the spiral groove on the second section.

[0153] The outer circumferential surface of the roller 121 is designed to be formed with a spiral groove, which can increase the friction between the roller 121 and the material belt 111 compared to a smooth surface, thereby helping to reduce the sliding or movement of the material belt 111 on the roller 121, thereby reducing the possibility of wrinkles caused by the slipping of the material belt 111. In addition, the spiral groove also helps to evenly distribute the tension to each part of the material belt 111, reduce the tension concentration phenomenon, and maintain the flatness of the material belt 111.

[0154] An embodiment of the present application further provides an unwinding method, which is applied to the unwinding system 1000 of any of the above embodiments. The unwinding method includes the following steps.

[0155] S10, when the unwinding roll 111A carried by the reel 110 at the unwinding station is unwound to become the remaining roll 111B, the rotating shaft 300 is controlled to rotate so that the reel 110 carrying the remaining roll 111B is switched to the loading and unloading station.

[0156] S20, controlling the pressing member 130 to move to jointly clamp the material strip 111 released from the remaining material roll 111B with the roller set 120 in the contact position.

[0157] S30, obtaining the separation status, and confirming whether the separation status is separated or about to be separated.

[0158] S40, if the result is yes, control the cutting device 400 to move between the pressing member 130 and the head of the unwinding roll 111A carried by the reel 110 switched to the unwinding station to cut off the material tape 111 released from the remaining roll 111B.

[0159] The unwinding system 1000 may further include a controller. Alternatively, the controller may also be a host computer of the unwinding system 1000. The controller includes at least one processor and at least one memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the unwinding method of any embodiment is implemented.

[0160] In the case where the unwinding system 1000 further includes a fluid power cylinder, when the result of S30 is yes, before S40, the unwinding method may further include S50.

[0161] S50, controlling the fluid pressure of the fluid power cylinder so that the pressing member 130 increases the pressure on the material strip 111 released from the remaining material roll 111B.

[0162] By increasing the fluid pressure of the fluid power cylinder, the output force of the fluid power cylinder can be increased, and then the pressure of the clamping member 130 on the material strip 111 released from the remaining material roll 111B can be increased, thereby increasing the clamping force of the clamping member 130 and the roller group 120 at the contact position on the material strip 111.

[0163] In this embodiment, when the cutting device 400 cuts the material strip 111, the clamping force on the material strip 111 is increased, and a large clamping force is maintained on the material strip 111, which is conducive to promoting neat cutting, thus helping to improve cutting accuracy and cutting effect.

[0164] In the case where the pressing member 130 includes at least one pressing roller 131 and the unwinding system 1000 further includes a driving motor 200 , when the result of S30 is yes, before S40 , the unwinding method may further include S60 .

[0165] S60, controlling the torque provided by the driving motor 200 or controlling the rotation speed of the driving motor 200, so that the damping force applied by the pressing roller 131 to the material strip 111 released from the remaining material roll 111B is increased.

[0166] By increasing the torque provided by the driving motor 200 and / or reducing the rotation speed of the driving motor 200 , the damping force applied by the pressing roller 131 to the material strip 111 released from the remaining material roll 111B can be increased, so that the tension of the material strip 111 is increased.

[0167] In this embodiment, the material belt 111 is tensioned when the cutting device 400 cuts the material belt 111, which is conducive to neat cutting, thus helping to improve cutting accuracy and cutting effect.

[0168] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

[0169] In a specific embodiment of the present application, Figures 1 to 11 As shown, the unwinding system 1000 of the rolling device includes a frame 500, a rotating shaft 300, a turret 100, two color sensors, two roll diameter sensors 150, a servo motor, a cylinder and a pressure roller 131. The servo motor is connected to the pressure roller 131 through a reducer 210 to drive the pressure roller 131 to rotate in a counterclockwise direction.

[0170] The rotating shaft 300 extends horizontally, and the turret 100 is connected to the rotating shaft 300 by transmission. The turret 100 includes two reels 110 and two rollers 121, which are evenly and spaced apart around the axis of the rotating shaft 300, and the reels 110 and the rollers 121 are alternately arranged along the circumference of the rotating shaft 300. Two color sensors correspond to the two reels 110 one by one, and the two color sensors are arranged at an interval of 180° along the circumference of the rotating shaft 300, and each color recognition unit is arranged at the front end of the corresponding reel 110 along the rotation direction of the rotating shaft 300. Two roll diameter sensors 150 correspond to the two reels 110 one by one, and the two roll diameter sensors 150 are arranged at an interval of 180° along the circumference of the rotating shaft 300.

[0171] The turret 100 can rotate with the rotating shaft 300, thereby driving the reel 110 to switch between the unwinding station and the loading and unloading station. At the unwinding station, the reel 110 rotates counterclockwise to unwind the roll 111A to be unwound. When the roll diameter sensor 150 corresponding to the reel 110 at the unwinding station detects that the roll diameter of the material roll is less than the set value, the roll 111A to be unwound on the reel 110 becomes the remaining roll 111B, and the turret 100 rotates 180° clockwise, so that the positions of the reel 110 at the unwinding station and the reel 110 at the loading and unloading station are interchanged, and the remaining roll 111B arrives at the loading and unloading station with the reel 110, and at this time, a roller 121 located at the rear end of the reel 110 carrying the remaining roll 111B and adjacent to it reaches the contact position. At the contact position, the roller 121 abuts against the pole piece released by the remaining roll 111B. The cylinder then drives the pressing roller 131 to move upward to press the pole piece against the over roller 121. At the same time, the servo motor drives the pressing roller 131 to rotate in a counterclockwise direction to apply a damping force to the pole piece.

[0172] The remaining material roll 111B continues to unwind until the color sensor corresponding to the reel 110 of the loading and unloading station detects the color of the collector exposed at the tail of the electrode, controls the air pressure of the cylinder to increase, thereby increasing the output force of the cylinder, and controls the torque output by the servo motor to the pressure roller 131 to increase and the speed of the servo motor to decrease, and then controls the cutting device 400 to move between the clamping part 130 of the pressure roller 131 and the material head of the material roll 111A to be unwound carried by the reel 110 switched to the unwinding station, so as to cut off the material strip 111 released by the remaining material roll 111B.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A reeling system, characterized in that: include: A turret is configured to rotate with a rotating shaft; the turret comprises an equal number of reels and a plurality of roller groups, the rollers of the roller group and the reels are parallel to the rotating shaft, and the reels and the roller groups are spaced and alternately arranged along the circumference of the rotating shaft; the rotation of the turret drives the reels to switch at least between an unwinding station and a loading and unloading station; at the unwinding station, the reel to be unwound carried by the reel is unwound to become a remaining reel; when the reel carrying the remaining reel is switched to the loading and unloading station, the roller group between the reel switched to the loading and unloading station and the reel switched to the unwinding station reaches a contact position to abut against the material tape released by the remaining reel; A pressing member, which can move to clamp the material strip released from the remaining material roll together with the roller group in the contact position; A status confirmation unit, used for confirming the separation status of the reel at the loading and unloading station and the tail of the remaining reel carried by the reel; The cutting device moves between the clamping member and the head of the roll to be unwound carried by the reel switched to the unwinding station to cut off the material strip released by the remaining roll when the confirmation result of the status confirmation unit is that the roll has been separated or is about to be separated.

2. The unwinding system according to claim 1, characterized in that: The pressing member includes at least one pressing roller, and the pressing roller is parallel to the rotating shaft; the number of the rollers included in the roller group is the same as the number of the pressing rollers included in the pressing member; Each of the pressure rollers can move to correspond one-to-one with each of the rollers of the roller group at the contact position, and each of the pressure rollers and the corresponding roller face each other to jointly clamp the material strip released from the remaining material roll.

3. The unwinding system according to claim 2, characterized in that: It also includes a driving motor, which is drivingly connected to the pressing roller to provide torque to the pressing roller. Under the action of the torque, the pressing roller rotates around its own axis to apply a damping force to the material strip released from the remaining material roll.

4. The unwinding system according to claim 3, characterized in that: The drive motor is configured to provide an adjustable torque; And / or, the speed of the driving motor is adjustable; And / or, the driving motor is drivingly connected to the pressure roller via a reducer.

5. The unwinding system according to claim 3, characterized in that: The state confirmation unit is a torque sensor, and the torque sensor is used to detect the torque. When the change in the torque exceeds a threshold, the separation state is confirmed to be separated.

6. The unwinding system according to any one of claims 1 to 5, characterized in that: The material strip released from the remaining material roll has a first area and a second area which are arranged in sequence and have different colors along its own transmission path, the second area is located at the material tail, and the color of the reel is the same as that of the first area; The state confirmation unit is a color recognition unit, and the color recognition unit is configured to face the reel of the loading and unloading station. When the color recognition unit recognizes the color of the second area, it confirms that the separation state is about to be separated.

7. The unwinding system according to claim 6, characterized in that: The color recognition unit is any one of a color sensor, a spectrum sensor and an image sensor; And / or, the color recognition unit is arranged on the turret; the color recognition units are provided in plurality and are arranged at intervals along the circumference of the rotating shaft, the plurality of color recognition units correspond one-to-one to the plurality of reels, each of the color recognition units is located between two adjacent reels and faces the corresponding reel; along the rotation direction of the rotating shaft, each of the color recognition units is arranged at the front end of the corresponding reel.

8. The unwinding system according to any one of claims 2 to 5, characterized in that: Also includes: A plurality of first position-limiting part groups arranged on the turret correspond one-to-one to the plurality of roller groups; A lifting mechanism is connected to the pressure roller, and the lifting mechanism is provided with a second limiting part group; the number of first limiting parts of the first limiting part group is the same as the number of second limiting parts of the second limiting part group, and one of the first limiting part and the second limiting part is a pin hole, and the other is a pin shaft matched with the pin hole; Wherein, the lifting mechanism is used to drive the pressure roller to move in the vertical direction, and the pressure roller has at least a first position and a second position; in the first position, the second limiting portion group is coaxially arranged with the first limiting portion group corresponding to the roller group at the contact position; in the second position, the second limiting portion group is plug-fitted with the first limiting portion group corresponding to the roller group at the contact position, and each of the pressure rollers and the corresponding roller jointly clamp the material strip released from the remaining material roll.

9. The unwinding system according to claim 8, characterized in that: The turret also includes a plurality of arm groups corresponding to the plurality of rollers one by one, the arm groups include two support arms spaced apart along the axial direction of the rotating shaft, the two ends of each of the rollers are respectively connected to the two support arms of the corresponding arm group, and each of the support arms is provided with a first limiting portion.

10. The unwinding system according to any one of claims 1 to 5, characterized in that: Also includes: A lifting mechanism, the lifting mechanism is used to drive the pressing member to move in the vertical direction, so that the pressing member can move to the point where it can clamp the material strip released from the remaining material roll together with the roller group at the contact position; Wherein, the lifting mechanism includes a linear actuator and a lifting platform, the linear actuator is transmission-connected to the lifting platform to drive the lifting platform to move in a vertical direction, and the pressing member is connected to the lifting platform.

11. The unwinding system according to claim 10, characterized in that: The linear actuator is a fluid power cylinder, which generates power through fluid to drive the lifting platform to move up and down, and the fluid pressure of the fluid power cylinder is adjustable.

12. The unwinding system according to claim 10, characterized in that: It also includes a frame, and the lifting mechanism is installed on the frame; The frame is provided with a resisting block, the resisting block having an inclined surface, the inclined surface being inclined to the horizontal plane, and the inclined surface having a first end and a second end along the inclined direction of the inclined surface; the resisting block is configured to be able to move horizontally under the action of an external force to switch between a first extreme position and a second extreme position; The lifting platform comprises a fixed platform and a moving platform which are arranged opposite to each other and spaced apart in the vertical direction, the fixed platform is transmission-connected with the linear actuator, the moving platform can move vertically relative to the fixed platform, and the moving platform is connected with the pressing member and fixedly provided with a sliding part; In the first extreme position, the sliding part abuts against the first end; when the abutting block switches from the first extreme position to the second extreme position, the sliding part slides along the inclined surface, driving the moving platform to move, so that the vertical distance between the moving platform and the fixed platform gradually increases; in the second extreme position, the sliding part abuts against the second end.

13. The unwinding system according to claim 12, characterized in that: It also includes a hand wheel and a transmission mechanism; The hand wheel is in transmission connection with the transmission mechanism, and the hand wheel drives the abutting block to move horizontally through the transmission mechanism under the rotation of external force.

14. The unwinding system according to claim 12, characterized in that: The lifting platform further comprises a lifting rod extending in a vertical direction, one end of the lifting rod is fixedly connected to the moving platform, the other end of the lifting rod passes through the fixed platform and extends to a side of the fixed platform facing away from the moving platform, and the lifting rod can be lifted and lowered relative to the fixed platform; A stopper protrusion is fixedly connected to at least one of the lifting rods, and the stopper protrusion is located between the fixed platform and the movable platform. In the first extreme position, the stopper protrusion abuts against the fixed platform, and / or the sliding portion is connected to the other end of one of the lifting rods.

15. The unwinding system according to any one of claims 1 to 5, characterized in that: The outer circumferential surface of the roller is concave to form a spiral groove.

16. A rolling device, characterized in that: The invention comprises two rollers arranged opposite to each other and an unwinding system as claimed in any one of claims 1 to 15.

17. A battery production system, characterized in that: The battery production system comprises the unwinding system according to any one of claims 1 to 15, or the battery production system comprises the rolling device according to claim 16.

18. An unwinding method, applied to the unwinding system according to any one of claims 1 to 15, characterized in that: The unwinding method comprises: When the unwinding roll carried by the reel at the unwinding station becomes the remaining reel, controlling the rotating shaft to rotate so that the reel carrying the remaining reel is switched to the loading and unloading station; Controlling the pressing member to move to clamp the material strip released from the remaining material roll together with the roller group in the contact position; Acquire the separation state, and confirm whether the separation state is separated or about to be separated; If the result is yes, the cutting device is controlled to move between the pressing member and the head of the roll to be unwound carried by the reel switched to the unwinding station to cut off the material strip released from the remaining roll.

19. The unwinding method according to claim 18, characterized in that: In the case where the unwinding system further comprises a fluid power cylinder, If the result is yes, before controlling the cutting device to move to cut the material strip between the pressing member and the material head of the to-be-unrolled roll carried by the reel switched to the unwinding station, the method further includes: The fluid pressure of the fluid power cylinder is controlled so that the pressure of the pressing member on the material strip released from the remaining material roll is increased.

20. The unwinding method according to claim 18, characterized in that: In the case where the pressing member includes at least one pressing roller and the unwinding system further includes a driving motor, If the result is yes, before controlling the cutting device to move to cut the material strip between the pressing member and the material head of the to-be-unrolled roll carried by the reel switched to the unwinding station, the method further includes: The torque provided by the driving motor is controlled or the rotation speed of the driving motor is controlled so that the damping force applied by the pressing roller to the material strip released from the remaining material roll is increased.

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